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https://git.ffmpeg.org/ffmpeg.git
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94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*
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* PNM image parser
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* Copyright (c) 2002, 2003 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "parser.h" //for ParseContext
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#include "pnm.h"
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static int pnm_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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ParseContext *pc = s->priv_data;
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PNMContext pnmctx;
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int next;
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for(; pc->overread>0; pc->overread--){
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pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
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}
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retry:
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if(pc->index){
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pnmctx.bytestream_start=
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pnmctx.bytestream= pc->buffer;
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pnmctx.bytestream_end= pc->buffer + pc->index;
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}else{
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pnmctx.bytestream_start=
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pnmctx.bytestream= (uint8_t *) buf; /* casts avoid warnings */
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pnmctx.bytestream_end= (uint8_t *) buf + buf_size;
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}
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if(ff_pnm_decode_header(avctx, &pnmctx) < 0){
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if(pnmctx.bytestream < pnmctx.bytestream_end){
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if(pc->index){
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pc->index=0;
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}else{
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buf++;
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buf_size--;
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}
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goto retry;
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}
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#if 0
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if(pc->index && pc->index*2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index){
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memcpy(pc->buffer + pc->index, buf, pc->index);
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pc->index += pc->index;
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buf += pc->index;
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buf_size -= pc->index;
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goto retry;
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}
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#endif
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next= END_NOT_FOUND;
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}else{
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next= pnmctx.bytestream - pnmctx.bytestream_start
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+ avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
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if(pnmctx.bytestream_start!=buf)
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next-= pc->index;
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if(next > buf_size)
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next= END_NOT_FOUND;
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}
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if(ff_combine_frame(pc, next, &buf, &buf_size)<0){
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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AVCodecParser pnm_parser = {
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{ CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PAM},
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sizeof(ParseContext),
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NULL,
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pnm_parse,
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ff_parse_close,
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};
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